The Smartest Reason for Correct Valve Clearances!

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Introducing my other Channel "Things to Know" - which i'm just getting started. It's a go-to channel for insightful worldly explanations, handy tips, and expert advice on everyday things and repairs of domestic items. Here is the link: / @thingstoknow3645
There can be a number of problems that negatively affect the performance and dependability of the engine if the valve clearances are not set properly. The following are some possible effects of using inappropriate valve clearances:
Noise in the valve train might be caused by insufficient valve clearance. When the valves make contact with the rocker arms or cam followers, they could generate a ticking or tapping noise. On the other side, excessive valve clearance can cause a loud knocking sound as the parts of the valve train collide. These annoying noises are a sign of incorrect valve clearance settings.
Poor Engine Performance: Poor engine performance can result from incorrect valve clearances in a number of ways. A loss of compression may result from the valves' inability to fully close if the clearances are too tiny (tight). Reduced power output, poor fuel efficiency, and probable fires might result from this. On the other hand, high clearances (loose) might alter the timing of the valves, which will lead to inefficient combustion and poorer engine performance.
Increased Wear and Damage: Improper valve clearances might put too much stress on the parts of the valve train. The valves and seats may prematurely wear if the clearances are excessively tight and the valves stay slightly open. Due to this wear, the sealing effectiveness may be compromised, leading to compression loss and eventual valve burning. Additionally, if the clearances are excessively slack, the valves may strike the cam followers or rocker arms with too much force, speeding up wear and perhaps leading to component failure.
Interference between the valves and the pistons during their respective strokes is a possibility in engines with small valve clearances. This condition, known as valve-to-piston interference, can seriously harm the pistons and valves, possibly leading to bent pistons and valves as well as catastrophic engine failure.
Reduced Valve Lift: Poor valve clearances can restrict the maximum lift of the valve, which can limit the volume of fuel and air that can be injected into the cylinder as well as the volume of exhaust gases that can be released. The performance of an engine can be hampered by reduced valve lift, which can affect throttle response and power output.
To guarantee good engine functioning, longevity, and top performance, it is crucial to follow the manufacturer's recommendations and recommended valve clearance settings. These problems can be avoided and the health of the engine maintained with frequent valve clearance inspection and adjustment.
Thank you
Craig (Owner and Creator of The Repair Specialist Channel)
#ValveClearance
#EnginePerformance
#ValveTrain
#EngineMaintenance
#ValveAdjustment
#ValveToPistonInterference
#EngineRepair
#ValveLift
#EngineEfficiency
#ValveWear
#AutomotiveMaintenance
#ValveHealth
#InternalCombustion
#ValveTiming
#EngineSafety

[@TheRepairSpecialist]

Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍

[@rjpaniergo1867]

so for excessesive push on the valve spring (no clearance + extra push) can cause overheating resulting on lean sparkplug reading?

[@vinuyajohn719]

Hi is it good to have a 0.05mm intake and 0.06mm exhaust valve clearance for 125cc pushrod engine?

[@-infinity0infinity61]

excellent! how many people now have a clear understanding now as to why they set the clearances. thanks

[@Garrus_Vakarian_N7]

Man.. this is genosity. You could be a proffesor ;D

[@TheRepairSpecialist]

Thank you so much. Craig

[@thisisyourcaptainspeaking2259]

And there's a huge slice taken out of the cylinder wall, leading to low compression.

[@TheRepairSpecialist]

😂👍

[@netdoctor1]

I'd be interested in seeing the leak-down test results...

[@georgio3674]

Perfect explanation. 🙏 I’m glad I stumbled upon your channel

[@petepete3389]

Hands down the best four-stroke video I have ever seen.

[@TheRepairSpecialist]

Thank you so much. I really appreciate it. Craig 👍👍👍

[@arthurfricchione8119]

Craig another well put together video. A very thorough explanation of how the valve train functions. Thank you for sharing. 👍

[@TheRepairSpecialist]

Thanks so much Artie. Craig

[@GuysPlayingWithTools]

Nice video. The cutaway motor is a great tool to show this

[@TheRepairSpecialist]

Thanks 👍

[@EricHaninga]

You got a subscriber. Cool explanation 💯

[@TheVTRainMan]

Nice demonstration and explanation. I had a rough understanding of the importance of valve clearances. But, this cleared up a lot of my un-educated guessing as to what exactly was happening. I am nearly certain valve clearance issues are causing rough start and performance issues on my lawn tractor.

[@altpotus6913]

Not enough clearance can cause backfiring.

[@TheRepairSpecialist]

Absolutely 👍

[@tommyc9237]

Plenty of videos out there about HOW but this is great to explain WHY. I'm about to adjust the valve clearance on an old Mercedes diesel which I realize is different mechanically but much of this absolutely applies. Well done.

[@TheRepairSpecialist]

Thank you so much for your kind feedback and good luck with your Mercedes Diesel valve clearance adjustment. Craig 👍

[@teddysurf]

So here’s a question if anybody sees this and wants to chime in. I am looking at doing a valve adjustment on a KTM 390 engine and a lot of the tutorials I found on KZbin adjust the valve clearances on the looser end of the spec range as opposed to the tighter end of the range? They state they do that because they’re worried about the cylinder head hitting the valves. However, based on this video that doesn’t seem likely unless the engine is not timed, right. It also seems less likely on the intake instead of exhaust. In my mind going tighter in the gap range would leave room to wear thus staying in spec longer?

[@wtfman5313]

Very thorough guide! Excellent video!

[@DimitrisTsoykalas]

Hello ,a question if you have time ofcource. Talking for a motorcycle (yamaha crypton T110) that having lets say 3rd ,4th gear and going with no throttle downhill then (always) hearing/happening burn fuel at exchaust (lets say every 10 seconds etc) So my question is ,,,suppose that carburator is fine(that maybe is not) Is it possible that incorrection adjustment ( or damage) in valves is provoking this chap of noise ?(that propably also make loose fuel more than it needs-not burned correctly fuels) Thank you in advance,

[@TheRepairSpecialist]

Hi there! Naturally, I'm pleased to assist you with your Yamaha Crypton T110 question. It's excellent that you're observing your motorcycle's sounds and behaviours. Although the issue may have something to do with the valves based on what you've mentioned, it's important to take other things into account as well. Incorrect valve adjustment or damage may be the cause of the noise you're hearing and inefficient fuel burning, but it's also a good idea to check other parts like the air filter, spark plugs, and ignition timing. All of these may have an impact on your motorcycle's overall performance and how well the engine burns fuel. To ensure an accurate diagnosis, it could be a good idea to get the vehicle inspected by a qualified mechanic if you are unsure about the issue. Please don't hesitate to inquire if you need help or have any further questions. Enjoy your ride! Thanks Craig

[@DimitrisTsoykalas]

@@TheRepairSpecialist Thank you very very much. I ve just asked to be ready to face some strange engineers that even they dont know directly or even they just want my few money.Thats why,,,OK,,,i will check them as you ve said...Thank you for your video-lessons !!! Jim,,greedings from Athens(greece) PS..i like that noise because its making feel as Colin mcray coming to a corner !!(heheh) ..but i must correct it sometime !

[@ivanreyneke7573]

Thank you so much for your super informative videos. Really very helpfull. Learning so much.

[@TheRepairSpecialist]

You are so welcome! Thank you. Craig 👍

[@sebinasia]

Brilliantly explained - thank you!

[@TheRepairSpecialist]

You're very welcome! Thank you. Craig

[@JackChapman-rd3jq]

I was told my warranty was denied for assumed reasoning. The engine failed because a tappet struck the spark plug. How is this possible?

[@tractioncontroldelete]

Best explanation on KZbin! Bravo

[@TheRepairSpecialist]

Wow, thanks!

[@CarolinaReaperr]

Liked, commented and subscribed!! Thank you for the information in such a simple strait forward format. Would love to see a more in depth symptom video from you!

[@TheRepairSpecialist]

Thank you so much for your kind and motivating comment. Craig 👍👍👍

[@sorusty5764]

Very nice thats why time to time my motorcycle exhaust note sounds different than the last time we check the clearances... and the engines response too

[@romanb.6905]

And all this happens lets say 12'000 per minute /superbike. It is 200 times per second! This is incredible!

[@netdoctor1]

Yeah. Even at 3,000rpms it's insane to think that piston is up-and-down 50 times a second.

[@mariobulut7475]

svaka cast...odlicno brutalno objasnjeno...

[@suleimanchoonka9280]

Best video I found

[@marcmyers1465]

Excellent Dissertation ! Well Done, Sir !!! 🤓👍

[@taguanskorch178]

Your the best! Thank you for your teachings!

[@georgenicholas4700]

Dam... I did t know of anything about valves and engine, but now I sure do know thanks professor you did great

[@TheRepairSpecialist]

Thank you so much. Craig

[@meesiphht2769]

Gee, I wish I would have seen this in the 7th grade.

[@chaosloveBronson]

Visuals are awesome. TY

[@TheRepairSpecialist]

Thank you so much 👍👍👍

[@pier-olivierperreault231]

Thank you ! It explain very whell why I have to check my valve clearence often on my motorcycles !

[@BillDickert]

I find your information very clear and understandable. Thank you..

[@michaelcscott1985]

Great explanation. Thank you.

[@TheRepairSpecialist]

You are welcome! Thank you 👍👍

[@billyicon13]

just a mention, did you know that you can increase compression in a lot of applications, by having a larger lash on the intake valve,,,,, why you ask? because just like it takes a little longer to start opening the intake valve when the intake lash, it also closes sooner, so that the piston may not started traveling upwards or traveled upwards as far, giving more stroke of the piston with the valves closed to build compression, basically its a very crude way to change cam timing

[@hellohello8556]

Quality content thankyou.👍

[@inline4forlife]

Never knew it was such a delicately balanced system in a sense, you explained it so clearly. Cheers pal

[@EngineLover17]

THE BEST EXPLANATION

[@TheRepairSpecialist]

Thank you for your kind feedback. Craig

[@BjornFSE]

Great visual explanation

[@whittlesey]

Really appreciate this explanation

[@DAANNNGG]

I just did a valve clearance on my 2015 Suzuki 6hp (DF6) and now I’m getting less than 30psi compression.

[@ISAACSACKEYEAGLES]

Thanks very much, I was struggling with my tappets gaps ,but thank you because you explained practically and vividly 🎉❤

[@thromboid]

As one wag once said concerning valve clearances, "I'd rather hear 'em than smell 'em"!

[@pauljanssen7594]

I prefer to adjust them at the correct clearance so things aren't slapping around.

[@fullthrottle2008]

Great vid! Clearances shown look like the actual settings for the exhaust valve on my re Himalayan 411 😅

[@ninomaravilla5505]

0p if you have a 212 CC brand new motor predator and starts backfiring how does that possibleCan you please help me on that one cuz that's what's happening to my motor thank you

[@ardoughman1323]

Than you very much for this very informative technical video. Appreciated a lot. 👍👍👍

[@TheRepairSpecialist]

So nice of you. Thank you. Craig

[@abdul-kabiralegbe5660]

I'm wondering why there's any suction force in the cylinder during the later part of the power stroke. I thought the pressure in the cylinder at this stage would be higher than atmospheric. Unless, the expansion of gases during combustion isn't enough to fill the cylinder when the piston is at BDC. Is this a consequence of volumetric efficiency (i.e. no naturally aspirated cylinder is ever 100% filled during the intake stroke) so there's bound to be a slight vacuum at BDC of power stroke? What am I missing?

[@theazshow7327]

Hello, thanks for the explanation, I have hydraulic lifters, but the valves remain open, I know tha gap you showed there is the problem, but since I have hydraulic lifters I don't know how to solve the problem, could the valves be too long? Or maybe the rocker arms?

[@03flhtcui]

Seriously…this Gentleman’s channel is the best of KZbin.

[@TheRepairSpecialist]

Wow. Thank you. I really appreciate your kind feedback. Craig 👍👍👍👍

[@ernstkaisuma-rf8ch]

Thanks brother it's very helpful to watch this

[@TheRepairSpecialist]

Always welcome

[@MartinPowell-e3p]

I UNDERSTAND THE WORKINGS OF THE VALVES MUCH BETTER NOW,THANKS TO YOUR BRILLIANT AND INFORMATIVE VIDEO,THANK YOU.

[@tomsheets6399]

I learned a lot by this video. Thank you for the clear explanation.

[@davidjones8680]

What a brilliant and easy to understand explanation, top job! Liked and subscribed.

[@TheRepairSpecialist]

Awesome, thank you so much for your kind feedback. I really appreciate it. Craig

[@coriscotupi]

Clear, concise information. Well done, sir. Liked, subscribed.

[@CCCollinsw]

What do you think about valve lashes to tight on my Honda rancher 350 trx I have oil coming out my exhaust and blow by tube in air box do you suppose this could be caused from over tight valves

[@matthewisaacs5307]

Loved the clarity and detail, and as a DIY unschooled mechanic, I learned some good points. Since learning about it, I have been setting my valves as near to "zero-lash" as possible always allowing for pushrod rotation when valve fully closed

[@TheRepairSpecialist]

I'm delighted to hear that you enjoyed my video on 4-stroke valve clatter/lash and found it helpful for your mechanic endeavors! It's fantastic that you've taken an interest in setting your valves and striving for a "zero-lash" adjustment. Indeed, paying attention to the finer details like allowing for pushrod rotation when the valve is fully closed can make a significant difference in how your engine performs. It's all about achieving that optimal valve clearance to ensure efficient combustion and minimize noise. Keep up the great work, and if you ever have more questions or need further advice on any DIY mechanical tasks, feel free to reach out. Learning and hands-on experience are key in this field, and your dedication is truly commendable! Thanks again Craig

[@derickmorgan6164]

That lecture has been so helpful to me

[@TheRepairSpecialist]

Thank you 👍👍

[@VaniGwynn]

Jackson Kimberly Thomas Charles Davis Carol

[@netdoctor1]

Excellent demonstration. Thank you for sharing!!

[@TheRepairSpecialist]

You are welcome! Thank you

[@KRAMPUS_G60_16V]

Great!

[@pauloguevara8646]

Really complete and clear explanation

[@TheRepairSpecialist]

Thank you 👍👍👍

[@shanks9362]

Thank you! much easier to understand.

[@mora103]

My explanation usually consists of it just is, or it just does 😂 It takes a lot of effort to learn this trait and a lot more to teach it or explain it to others 😅 you did a great job though 👏👍

[@paulkennedy5822]

Learned a lot as I always do when I watch your videos. I feel that you are the best at explaining the basis function as well as the nuances of small engines. Thank you

[@TheRepairSpecialist]

Thank you. I really appreciate your kind and thoughtful comment. Craig 👍👍👍👍

[@roybatty2030]

Never realised how many factors in play here. Excellent video, thanks! Will check my lawnmower tapers now…

[@TheRepairSpecialist]

Thank you 👍👍👍

[@CR8VE]

Cars heads work off clearances or tolerances tolerances are torque specifications and clearances are as obvious clearances.

[@jesussantibanez6711]

Thanks for sharing very interesting video greetings from mexico

[@leonart7875]

Makes sense

[@efrahaimrn]

is there a computation to determine the proper gap for any engine with the same mechanism?

[@wetcatfur9982]

nice vid

[@bobwa399]

Is it ok to set tappet loose after a fresh engine rebuild? the idea is to let valve seat to adjust properly cause they were built new too.

[@mikeg983]

Do valve clearances get larger as time goes on? Or do they get smaller? Or can they do both?

[@FosterGoat]

Best explanation I have ever seen!

[@acclandofpalace]

Greetings, in short, should the oral cavities be more open or less open? Thanks

[@randomvideosontheinternet6850]

Thank you for tgis informative video

[@TouchofDepth]

Thank you so much for explaining, your way of teaching makes so much sense even for my dense head. Cheers

[@TheRepairSpecialist]

You're very welcome! Thank you for your feedback. Craig 👍👍👍

[@RyanHodge-hl4bz]

I genuinely appreciate you good sir. I am a duck in the desert messing with my sons gocart. This was a real blessing keep up with the spreading of knowledge!

[@TheRepairSpecialist]

Thank you so much 👍👍👍

[@Sugrshane]

Awesome video!! Thanks for your time and knowledge!!

[@TheRepairSpecialist]

Thank you so much for your kind feedback. Craig 👍👍

[@APPS333]

push rod much better for timing chain

[@wolfschindler8921]

I heard that valve clearances get tighter over time due to valve seat recession. Is that correct?

[@jack8356]

Thanks for you video i really like them

[@alanmeyers3957]

Simply for heat expansion.

[@franklinemix8048]

God bless you

[@TheRepairSpecialist]

You to 🙏

[@Cpt_bike_riders]

Great explanation, very understanding

[@mikeadler434]

👍👍

[@YenerYilmaz-m7o]

Great explanation. Thanks a lot.

[@NebulaM57]

Very well done sir!

[@TheRepairSpecialist]

Thank you! Cheers!👍

[@Abdallah86F]

So great explanation Thank you so much 🙏

[@TheRepairSpecialist]

You're most welcome. Thank you

[@leroydannel5717]

Very good info thank you

[@alistairbernard9574]

Very Enlightening Indeed. How much we take things for Granted. Just Finishing off some work on my 1970 Cortina Mk2 1600 so will definitely look into this area. The engine though is done only about 4000kms since a full overhaul.

[@khalidboulaajoul8399]

Very nice explication

[@playmaker7094]

slow and gets to the point very easilly, woow! great content

[@TheRepairSpecialist]

Thank you 👍

[@dylancrow7919]

When the air fuel mixture starts off compressed, and is ignited and expands, how could there ever be a vacuum during any point of the power stroke?

[@kennymosireland7069]

Very informative, do you now anyware I could find the correct valve setting for a citroen u25 1993. Diesal none turbo..

[@RamGaneshapillai-uq6ld]

Well explained, keep up the good work. Clearly spoken, very well presented. Good Luck, Be Happy.

[@kidkidu2]

One thing about the exhaust valve opening earlier to swirl in air. The exploded gasses are still expanding. When the exhaust is opened, it is done so that the burnt gasses wouldn't push back on the piston creating resistance on the exhaust stroke. The moment the valve is opened, burnt gasses that are still expanding rush out trough the valve opening (and create the exhaust sound). I don't think air could have a chance at entering the cylinder - at least from my knowledge.

[@remyassier1758]

great video thanks

[@alcerz984]

Would this noise be under load at about 2500 rpm’s?

[@TheRepairSpecialist]

thank you for reaching out with your question about tappet noise under load at around 2500 RPM. Tappet or valve noise can indeed occur under specific conditions, such as when the engine is under load at certain RPMs. Here are a few factors to consider regarding tappet noise: Valve Clearance: Insufficient valve clearance can cause tappet noise, particularly under load or at higher RPMs. If the clearance between the valve stem and rocker arm is too tight, the valves may not fully close, resulting in noise due to contact with other engine components. Engine Load: Under load, especially at mid-range RPMs like 2500 RPM, the engine experiences increased stress and demand. This can accentuate any existing valve clearance issues or mechanical vibrations, leading to audible tappet noise. Oil Pressure and Lubrication: Proper oil pressure and lubrication are essential for maintaining optimal valve operation. Low oil pressure or inadequate lubrication can contribute to tappet noise, especially when the engine is working harder under load. Other Factors: Additionally, factors like worn valve components, camshaft wear, or timing issues can also influence tappet noise under load conditions. To diagnose and address tappet noise under load at 2500 RPM, I recommend the following steps: Check Valve Clearances: Verify that the valve clearances are within the manufacturer's specified range. Adjust if necessary. Inspect Engine Components: Look for signs of wear or damage on valve train components, including the camshaft, lifters, and rocker arms. Evaluate Oil Condition: Ensure the engine is using the correct type and grade of oil, and check oil levels and pressure. Consider Professional Inspection: If the issue persists or if you're unsure about specific components, consulting a qualified mechanic or technician for a thorough inspection would be beneficial. I hope this information helps shed light on potential causes of tappet noise under load. If you have further questions or need assistance, feel free to ask. Thank you for being part of our community! Best regards, Craig

[@GaldinoMeta]

Indeed I gain knowledge in this video

[@tommysmith7701]

GREAT MATE THANK YOU

[@pauljanssen7594]

You have to mention how the cam grind is designed to open up the valve at the right angle of the camshaft design and closing. That way you're not beating up your valve train or burning up the valves.

[@crappieman11]

Great content love your channel